c# - Enabling Queue<T> with concurrency

Question

I have a previous question which I have provided my solution; however, I don't have access to ConcurrentQueue<T> since I am on .Net 3.5. I need Queue<T> to allow concurrency. I read this question and seems to present a problem if an item is not in the queue and the threaded method tries to dequeue an item.

My task now is to determine whether I can derive my own concurrent Queue class. This is what I came up with:

public sealed class ConcurrentQueue : Queue<DataTable>
{
    public event EventHandler<TableQueuedEventArgs> TableQueued;
    private ICollection que;

    new public void Enqueue(DataTable Table)
    {
        lock (que.SyncRoot)
        {
            base.Enqueue(Table);
        }

        OnTableQueued(new TableQueuedEventArgs(Dequeue()));
    }

    //  this is where I think I will have a problem...
    new public DataTable Dequeue()
    {
        DataTable table;

        lock (que.SyncRoot)
        {
            table = base.Dequeue();
        }

        return table;
    }

    public void OnTableQueued(TableQueuedEventArgs table)
    {
        EventHandler<TableQueuedEventArgs> handler = TableQueued;

        if (handler != null)
        {
            handler(this, table);
        }
    }
}

So, when a DataTable is queued, the EventArgs will pass a dequeued table to the event subscriber. Will this implementation provide me with a thread-safe Queue?

Answer 1

A quick trip to my favorite search engine revealed that my memory was correct; you can get the Task Parallel Library even on .NET 3.5. Also see The PFX team blog post on the subject, and the Reactive Extensions that you download in order to get at the desired System.Threading.dll.